QB Issue Resolution:

simple start does not track items you have in stock (inventory), you need QBO plus for inventory.

I don’t have simple start so I am not sure, but look at the gear menu, import to see what can be imported

Resolution for Issue 'We sell several hundred items. Can i import a list of items we sell as opposed to entering them one-by-one into products/services?' available: Yes (Solved).
Source: Intuit Community forum.

We sell several hundred items. Can i import a list of items we sell as opposed to entering them one-by-one into products/services?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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